import React, { useRef, useEffect, useState } from 'react'

const MultiPathGuide = () => {
  const canvasRef = useRef(null)
  const [nodes, setNodes] = useState([]) // 初始化节点数据
  const [activeNode, setActiveNode] = useState(null)

  // 绘制带箭头的引导线
  const drawArrowLine = (ctx, x1, y1, x2, y2) => {
    ctx.beginPath()
    ctx.moveTo(x1, y1)
    ctx.lineTo(x2, y2)
    ctx.strokeStyle = getPathColor(x1, y1, x2, y2)
    ctx.lineWidth = 4
    ctx.stroke()

    // 绘制箭头
    drawArrowHead(ctx, x2, y2, Math.atan2(y2 - y1, x2 - x1))
  }

  useEffect(() => {
    const canvas = canvasRef.current
    const ctx = canvas.getContext('2d')

    // 清空重绘
    ctx.clearRect(0, 0, canvas.width, canvas.height)

    // 绘制车位底图
    drawParkingSlots(ctx)

    // 绘制所有路径
    drawMultiPath(ctx, 1) // 从ID为1的起点开始绘制

    // 绘制所有节点
    nodes.forEach((node) => drawNode(ctx, node))
  }, [nodes])

  return (
    <div className="path-container">
      <canvas
        ref={canvasRef}
        width={800}
        height={600}
        // 交互事件绑定...
      />
      <PathEditor nodes={nodes} onUpdate={setNodes} />
    </div>
  )
}
